Understanding and Designing Serviceguard Disaster Recovery Architectures

Table 2 Metrocluster dependency with NPIV (continued)

Is NPIV Mandatory ?Product

NoMetrocluster with 3PAR Remote Copy

YesMetrocluster with EMC SRDF

Virtual Partitions/Integrity VM on Separate Hosts

In Figure 21, each VM host has a VM guest configured. VM guests’ Host1_VM1 and Host2_VM2

access the array on one site while Host3_VM3, and Host4_VM4 access the array on the remote

site. Serviceguard cluster is configured between Host1_VM1, Host2_VM2, Host3_VM3 and

Host4_VM4. A similar configuration can be created with virtual partitions instead of Integrity virtual

machines.

Figure 21 vPar/Integrity VM on Separate Hosts

Array Replication

Serviceguard Cluster

Heartbeat Network

Host 1 Host 2 Host 3 Host 4

Host1_VM1 Host2_VM2

FC Switch FC Switch

Host3_VM3 Host4_VM4

Disk Arrays

Multiple Virtual Partitions/Integrity VM on a single Host

In this case, Serviceguard cluster is configured between Host1_VM1, Host2_VM2, Host3_VM3

and Host4_VM4 (See Figure 22). Guests, host3_vm3 and host3_vm4, are configured on the same

physical host, host3. Such a configuration helps in consolidation of systems. However, such

configurations are generally not recommended because a single host failure might bring down the

applications in the entire data center. Similarly, vPars can be configured instead of HP VM guests.

Understanding Virtualized Environments configured in Metrocluster or Continentalclusters 45